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Thread: 7.5x53.5(GP90) Martini and 32-40 Bullets

  1. 04-09-2022, 01:15 AM #1
    HARRYMPOPE
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    7.5x53.5(GP90) Martini and 32-40 Bullets

    My Martini has a .295 bore and .307 groove.The throat is very large compared to the standard GP 90 chamber in 1889 Rifles.The throat starts at .328 and sort of tapers to groove diameter.My 1889 was .320 at chamber end.
    I modified the rear band of a .322 dia mold to. 328.With this it easily breech seats and the initial (over the hood) shooting session at 50 yards shows promise.
    Shooting a .020 oversize bullet goes with my theory that throat fit is more critical than bore dimensions.
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    Last edited by HARRYMPOPE; 04-09-2022 at 01:23 AM.
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  2. 04-09-2022, 08:03 AM #2
    Rapier
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    Nice old Martini.
    “There is a remedy for all things, save death.“
    Cervantes

    “Never give up, never quit.”
    Robert Rogers
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    There are three kinds of men. The one that learns by reading. The few who learn by observation. The rest of them have to pee on the electric fence for themselves.
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  3. 04-09-2022, 08:20 AM #3
    pworley1
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    Very nice rifle. Great shooting.
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  4. 04-09-2022, 10:50 AM #4
    gnoahhh
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    Bravo!!
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  5. 04-09-2022, 11:00 AM #5
    BP Dave
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    The washer on the side of the mold while in the chuck had never occurred to me--thanks for the photo with the great idea, and Good Shooting!

    --DJ
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  6. 04-09-2022, 06:37 PM #6
    koger
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    Sweeet Martini, nice wood also.
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  7. 04-10-2022, 01:52 PM #7
    HARRYMPOPE
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    Out today and shot it a bit more.i shot the .32 bullet breech seated at 50 yards and it did fine.i also shot an ideal stop ring #308277 that i enlarged rear band to .313(was .308) and the ring to .324(it was .319)
    I shot two groups finger seated at 100 yards and showed promise.

    Attachment 298842
    Attachment 298843
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  8. 04-20-2022, 06:03 AM #8
    barrabruce
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    Very nice.
    Thankyou.
    Never seen a 30 cal stop ring bullet.
    Very nice shooting.
    Did you make the push in seater?
    Does it hold the bullet in the case then use a plunger to final seat when the case is in the chamber?
    I may have to play some more with a rifle I have.
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  9. 08-13-2022, 02:41 PM #9
    HARRYMPOPE
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    Quote Originally Posted by barrabruce View Post
    Very nice.
    Thankyou.
    Never seen a 30 cal stop ring bullet.
    Very nice shooting.
    Did you make the push in seater?
    Does it hold the bullet in the case then use a plunger to final seat when the case is in the chamber?
    I may have to play some more with a rifle I have.
    the stop ring seats in case .The .32 bullet I made a push seater.
    Your mother was a hamster, and your father smelt of elderberries
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  10. 08-13-2022, 02:46 PM #10
    HARRYMPOPE
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    Quote Originally Posted by barrabruce View Post
    Very nice.
    Thankyou.
    Never seen a 30 cal stop ring bullet.
    Very nice shooting.
    Did you make the push in seater?
    Does it hold the bullet in the case then use a plunger to final seat when the case is in the chamber?
    I may have to play some more with a rifle I have.
    the stop ring seats in case .The .32 bullet I made a push seater. Recently had Accurate make a dedicated stop ring 2 cavity I now use
    Your mother was a hamster, and your father smelt of elderberries
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BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
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GC Gas Check